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Abstract: The resonant interaction of laser light with atoms is analyzed from thetime-dependent density functional theory perspective using a model Helium atomwhich can be solved exactly. It is found that in exact-exchange approximationthe time-dependent dipole shows Rabi-type oscillations of its amplitude.However, the time-dependent density itself is not well described. Theseseemingly contradictory findings are analyzed. The Rabi-type oscillations arefound to be essentially of classical origin. The incompatibility oftime-dependent density functional theory with few-level approximations for thedescription of resonant dynamics is discussed.



Autor: M. Ruggenthaler, D. Bauer

Fuente: https://arxiv.org/



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